Controlling the optical properties of plasmonic disordered nanohole silver films

ACS Nano
Thomas H ReillyJao van de Lagemaat

Abstract

Disordered nanohole arrays were formed in silver films by colloidal lithography techniques and characterized for their surface-plasmon activity. Careful control of the reagent concentration, deposition solution ionic strength, and assembly time allowed generation of a wide variety of nanohole densities. The fractional coverage of the nanospheres across the surface was varied from 0.05-0.36. Electrical sheet resistance measurements as a function of nanohole coverage fit well to percolation theory indicating that the electrical behavior of the films is determined by bulk silver characteristics. The transmission and reflection spectra were measured as a function of coverage and the results indicate that the optical behavior of the films is dominated by surface plasmon phenomena. Angle-resolved transmission and reflection spectra were measured, yielding insight into the nature of the excitations taking place on the metal films. The tunability of the colloidal lithography assembly method holds much promise as a means to generate customized transparent electrodes with high surface plasmon activity throughout the visible and NIR spectrum over large surface areas.

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Citations

Sep 29, 2011·Analytical and Bioanalytical Chemistry·Andreas B DahlinJanos Vörös
Jan 15, 2015·Physical Chemistry Chemical Physics : PCCP·Peng ZhengNianqiang Wu
Dec 25, 2012·Biophysical Journal·Michael J Saxton
May 9, 2014·Nano Letters·Mudassar VirkAndreas B Dahlin
May 19, 2018·Advanced Materials·Racheli RonAdi Salomon
Jul 15, 2015·Beilstein Journal of Nanotechnology·Cheng HuangThomas Schimmel
Jan 17, 2020·The Journal of Chemical Physics·Hiroki OhnishiTakumi Sannomiya

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